Governor



' 2 Sheets-Sheet 1. J. F. KIRBY.

(No Model.)

GOVERNOR.

N0. 454,218. Patented June 16,1891.

(110 MOdel.) 2 Sheets-Sheet 2. J. P. KIRBY.

GOVERNOR.

' No. 454,218. Patented June 16,1891.

. UNITED STATES PATENT ()FFICE.

JOHN F. KIRBY, OF SAN FRANCISCO, CALIFORNIA.

GOVERNOR.

SPECIFICATION forming part of Letters Patent No. 454,218, dated June 16,1891.

Application filed December 10, 1890- Serial No. 374,216. (No model.)

To all whmn it nwty concern.-

Beit known that 1, JOHN F. KIRBY, a citizen of Canada, residing in thecity and county of San Francisco, State of California, have in vented anImprovement in Governors; and I hereby declare the following to be afull, clear, and exact description of the same.

My invention relates to that class of governors adapted to regulate thevalves of the engine according to and by means of steampressure.

It consists in the novel construction and arrangement of partshereinafter fully described, and specifically pointed out in the claims.

The object of my invention is to provide a simple and eifective means ofgoverning the engine according to the steam-pressure.

Referring to the accompanying drawings for a more complete explanationof my invention, Figure 1 is avertioal section of my governor. Fig. 2 isan elevation of same. Fig. 3 is an elevation showing the connection ofthe generator with the valves.

Arepresents the cylinder of an engine, and B the steam-chest, in whichthe valves are located.

0 represents a steam-pipe which supplies the steam-chest.

D is a cylinder in which a piston (l is mounted, the rod d of whichextends through and projects beyond the cylinder. Under this pistonwithin the cylinder is a spring 61 which serves to normally hold thepiston up. The upper end of the cylinder D communicates with thesteam-pipe C in any suitable manner, as by the connection c.

E is a second cylinder, having within it a piston e, the rod 6' of whichprojects from the cylinder and has its end adapted to come in contactthough not connected with the end'of the piston-rod d, and the ends ofboth pistonrods may be enlarged to insure perfect contact. WVithin thecylinder E, under the piston e, is a spring e which serves to hold thepiston up. In the piston e is made an upwardly-swinging valve 6 andthrough said piston is also made a very small aperture 6. The piston-rodc is connected in any suitable manner with the valves in thesteam-chest.

I do not confine myself to any particular connection between the rodeand the valves, but the following will answer for such connection. Thevalve G is the common rotary form, by the oscillation of which theinletpassage is controlled. This valve carries a rocker-arm g, to thelower arm of which is connected the clutch-bracket H, in a groove or Wayin the top of which is seated a slidebar I, connected with therocker-wheel J, which is connected, as usual, with the eccentric of theengine. The slide-bar I is normally connected with and operates thebracket to actuate the rocker-arm and rock the valve by means of aclutch-bar K, carried by the bracket. The upper end of this bar bearsfrictionally against the slide-bar, while its lower end is seated in aslot or groove in the lower end of the bracket. A spring It bears on andreturns the clutch-bar. The lower end of the clutch-bar is locked in oneend of the slot and held to operative position by a block L, pivoted inone end of the slot or groove and bearing with its other end against thelower end of the clutch-bar. The side of the block projects to one side,and against this projection the lower end of a rod F, pivoted at itsupper end to a cross head or piece 6 on the piston-rod e, is adapted tobear. This rod F is bent at f, and to its bend is pivoted an arm f,mounted loosely on the valve.

M is fixed pin to throw the block L back to place.

N is the dash -pot connection with the rocker-arm g of the valve, and Ois the dashpot.

The operation of these parts is essentially similar to the cut-off ofmany engines. The rocking of the valve takes place normally through theconnection of the slide-barI with the bracket II; but when thepiston-rod e is moved down the rod F is moved down, and by reason of itsconnection with the arm fits lower end is moved over sidewise intocontact with the block L, and thereby throws said block out from behindthe clutch-bar K, thus tripping the bar, which being relieved no longerbinds on the slide-bar I, which is thus disconnected from the bracket.Thereupon the dash-pot connection acts to throw therocker-arm and closethe valve, and the bracket being swung over its block L comes in contacwith the fixed pin M, and is thereby returned to once more lock theclutch-bar.

I do not confine myself to the location of the two cylinders D and Ehere shown, nor to their connection with the steam-pipe and valve-chest,as these parts may be located in any suitable position and suitably withrelation to each other, the only requirements being that the uppercylinder D shall communicate with the steam-pipe and the pistonrod ofthe lower cylinder shall be connected with the valves, the piston-rodsof the two cylinders being adapted to come in contact with each other.The lower cylinder E is to be filled with some liquid.as, for example,oil, (represented by G,) though water or other liquid might be used.

The operation of the governor is as follows: The spring d in thecylinder D holds the piston (l and its rod (1 up normally to theirhighest position, and the spring e in the cylinder E likewise holds thepiston e and rode to their highest position, and in this position theadjacent ends of the two rods are close together. Now when thesteam-pressure in the boiler increases it forces down the piston d, andthe rod d of said piston, coming in contact with the rod 6' of thepiston e, forces said piston down, the valve 9" opening and allowing theliquid to pass up through the piston to the space above it. Thismovement of the piston-rod 0 effects the movement of the valves, asheretofore described. As the pressure in the boiler decreases, the upperrod d will rise again by the power of the spring (1 Now if the lowerpiston and rod were allowed to rise correspondingly by the power ofspring 6 so that the ends of the two rods would lie and follow incontact, it is obvious that the lower piston-rod, and consequently thevalves with which it is connected, would be subject to the jerks andunequal movements of the upper piston and rod on each stroke of theengine, due to the sudden and temporary relief of pressure in thesteampipe when the valves admitted steam to the cylinder; but by reasonof the liquid in. the lower cylinder, which cannot return from above thepiston 0, except through the small aperture 0', said piston movesupwardly very slowly, and is thus controlled by the liquid, which hasthe effect of keeping the valves steady and regulating them slowly andfree from any sudden movement of the upper piston.

Having thus described my invention,what I claim as new, and desire tosecure by Letters Patent, is

1. A governor for engines, consisting of a cylinder communicating withthe steam-pipe and having within it a spring-controlled piston and apiston-rod projecting from it, a second cylinder with piston and rod,said rod being adapted to come in contact with the piston-rod of thefirst cylinder, whereby the piston-rod of said second cylinder is moved,a connection between said last-named pistonrod and the engine-valves,and a means for effecting and controlling the return of the piston-rodof the second cylinder independent of the movement of the firstpiston-rod, substantially as herein described;

2. A governor for engines, consisting of the cylinder having acommunication with the steam-pipe, a spring-controlled piston and apiston-rod, the second cylinder having a piston and piston-rod adaptedto come in contact with the piston-rod of the first cylinder, whereby itis moved, a connection between the piston-rod of the second cylinder andthe engine-valves, a spring for returning the piston of the secondcylinder, and the valve and aperture in said piston, and liquid in saidsecond cylinder for controlling the return of the piston therein,substantially as herein described.

In witness whereof I have hereunto set my hand.

JOHN F. KIRBY.

\Vitnesses:

II. NoURsE, WM. F. 13001 11.

